Merge branch 'for-2.6.36' of git://git.kernel.dk/linux-2.6-block

* 'for-2.6.36' of git://git.kernel.dk/linux-2.6-block: (149 commits)
  block: make sure that REQ_* types are seen even with CONFIG_BLOCK=n
  xen-blkfront: fix missing out label
  blkdev: fix blkdev_issue_zeroout return value
  block: update request stacking methods to support discards
  block: fix missing export of blk_types.h
  writeback: fix bad _bh spinlock nesting
  drbd: revert "delay probes", feature is being re-implemented differently
  drbd: Initialize all members of sync_conf to their defaults [Bugz 315]
  drbd: Disable delay probes for the upcomming release
  writeback: cleanup bdi_register
  writeback: add new tracepoints
  writeback: remove unnecessary init_timer call
  writeback: optimize periodic bdi thread wakeups
  writeback: prevent unnecessary bdi threads wakeups
  writeback: move bdi threads exiting logic to the forker thread
  writeback: restructure bdi forker loop a little
  writeback: move last_active to bdi
  writeback: do not remove bdi from bdi_list
  writeback: simplify bdi code a little
  writeback: do not lose wake-ups in bdi threads
  ...

Fixed up pretty trivial conflicts in drivers/block/virtio_blk.c and
drivers/scsi/scsi_error.c as per Jens.

kernel/trace/blktrace.c

@@ -169,9 +169,12 @@ static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector,
 static const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ),
 				 BLK_TC_ACT(BLK_TC_WRITE) };
 
+#define BLK_TC_HARDBARRIER	BLK_TC_BARRIER
+#define BLK_TC_RAHEAD		BLK_TC_AHEAD
+
 /* The ilog2() calls fall out because they're constant */
-#define MASK_TC_BIT(rw, __name) ((rw & (1 << BIO_RW_ ## __name)) << \
-	  (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - BIO_RW_ ## __name))
+#define MASK_TC_BIT(rw, __name) ((rw & REQ_ ## __name) << \
+	  (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - __REQ_ ## __name))
 
 /*
  * The worker for the various blk_add_trace*() types. Fills out a
@@ -194,9 +197,9 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
 		return;
 
 	what |= ddir_act[rw & WRITE];
-	what |= MASK_TC_BIT(rw, BARRIER);
-	what |= MASK_TC_BIT(rw, SYNCIO);
-	what |= MASK_TC_BIT(rw, AHEAD);
+	what |= MASK_TC_BIT(rw, HARDBARRIER);
+	what |= MASK_TC_BIT(rw, SYNC);
+	what |= MASK_TC_BIT(rw, RAHEAD);
 	what |= MASK_TC_BIT(rw, META);
 	what |= MASK_TC_BIT(rw, DISCARD);
 
@@ -549,6 +552,41 @@ int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
 }
 EXPORT_SYMBOL_GPL(blk_trace_setup);
 
+#if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64)
+static int compat_blk_trace_setup(struct request_queue *q, char *name,
+				  dev_t dev, struct block_device *bdev,
+				  char __user *arg)
+{
+	struct blk_user_trace_setup buts;
+	struct compat_blk_user_trace_setup cbuts;
+	int ret;
+
+	if (copy_from_user(&cbuts, arg, sizeof(cbuts)))
+		return -EFAULT;
+
+	buts = (struct blk_user_trace_setup) {
+		.act_mask = cbuts.act_mask,
+		.buf_size = cbuts.buf_size,
+		.buf_nr = cbuts.buf_nr,
+		.start_lba = cbuts.start_lba,
+		.end_lba = cbuts.end_lba,
+		.pid = cbuts.pid,
+	};
+	memcpy(&buts.name, &cbuts.name, 32);
+
+	ret = do_blk_trace_setup(q, name, dev, bdev, &buts);
+	if (ret)
+		return ret;
+
+	if (copy_to_user(arg, &buts.name, 32)) {
+		blk_trace_remove(q);
+		return -EFAULT;
+	}
+
+	return 0;
+}
+#endif
+
 int blk_trace_startstop(struct request_queue *q, int start)
 {
 	int ret;
@@ -601,6 +639,7 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
 	if (!q)
 		return -ENXIO;
 
+	lock_kernel();
 	mutex_lock(&bdev->bd_mutex);
 
 	switch (cmd) {
@@ -608,6 +647,12 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
 		bdevname(bdev, b);
 		ret = blk_trace_setup(q, b, bdev->bd_dev, bdev, arg);
 		break;
+#if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64)
+	case BLKTRACESETUP32:
+		bdevname(bdev, b);
+		ret = compat_blk_trace_setup(q, b, bdev->bd_dev, bdev, arg);
+		break;
+#endif
 	case BLKTRACESTART:
 		start = 1;
 	case BLKTRACESTOP:
@@ -622,6 +667,7 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
 	}
 
 	mutex_unlock(&bdev->bd_mutex);
+	unlock_kernel();
 	return ret;
 }
 
@@ -661,10 +707,10 @@ static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
 	if (likely(!bt))
 		return;
 
-	if (blk_discard_rq(rq))
-		rw |= (1 << BIO_RW_DISCARD);
+	if (rq->cmd_flags & REQ_DISCARD)
+		rw |= REQ_DISCARD;
 
-	if (blk_pc_request(rq)) {
+	if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
 		what |= BLK_TC_ACT(BLK_TC_PC);
 		__blk_add_trace(bt, 0, blk_rq_bytes(rq), rw,
 				what, rq->errors, rq->cmd_len, rq->cmd);
@@ -925,7 +971,7 @@ void blk_add_driver_data(struct request_queue *q,
 	if (likely(!bt))
 		return;
 
-	if (blk_pc_request(rq))
+	if (rq->cmd_type == REQ_TYPE_BLOCK_PC)
 		__blk_add_trace(bt, 0, blk_rq_bytes(rq), 0,
 				BLK_TA_DRV_DATA, rq->errors, len, data);
 	else
@@ -1730,7 +1776,7 @@ void blk_dump_cmd(char *buf, struct request *rq)
 	int len = rq->cmd_len;
 	unsigned char *cmd = rq->cmd;
 
-	if (!blk_pc_request(rq)) {
+	if (rq->cmd_type != REQ_TYPE_BLOCK_PC) {
 		buf[0] = '\0';
 		return;
 	}
@@ -1755,20 +1801,20 @@ void blk_fill_rwbs(char *rwbs, u32 rw, int bytes)
 
 	if (rw & WRITE)
 		rwbs[i++] = 'W';
-	else if (rw & 1 << BIO_RW_DISCARD)
+	else if (rw & REQ_DISCARD)
 		rwbs[i++] = 'D';
 	else if (bytes)
 		rwbs[i++] = 'R';
 	else
 		rwbs[i++] = 'N';
 
-	if (rw & 1 << BIO_RW_AHEAD)
+	if (rw & REQ_RAHEAD)
 		rwbs[i++] = 'A';
-	if (rw & 1 << BIO_RW_BARRIER)
+	if (rw & REQ_HARDBARRIER)
 		rwbs[i++] = 'B';
-	if (rw & 1 << BIO_RW_SYNCIO)
+	if (rw & REQ_SYNC)
 		rwbs[i++] = 'S';
-	if (rw & 1 << BIO_RW_META)
+	if (rw & REQ_META)
 		rwbs[i++] = 'M';
 
 	rwbs[i] = '\0';
@@ -1779,8 +1825,8 @@ void blk_fill_rwbs_rq(char *rwbs, struct request *rq)
 	int rw = rq->cmd_flags & 0x03;
 	int bytes;
 
-	if (blk_discard_rq(rq))
-		rw |= (1 << BIO_RW_DISCARD);
+	if (rq->cmd_flags & REQ_DISCARD)
+		rw |= REQ_DISCARD;
 
 	bytes = blk_rq_bytes(rq);